clash

• verb

1 [I] to fight, argue, or disagree:
?clash with: Demonstrators clashed with police on the streets of Paris.

2 [I] if two colours or styles clash, they do not look nice together:
?clash with: That red tie clashes with your jacket.
3 [I] if two events clash, they happen at the same time:
?clash with: Unfortunately, the concert clashes with my evening class.
4 [I,T] to make a loud sound by hitting two metal objects together